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choosing macro names so as to avoid namespace conflicts

How package developer find out whether other packages already used a specific command name or not? How do they avoid name collision?

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    We've had variants of this question before. Take a look at tex.stackexchange.com/q/43674/86 (and the linked questions) and see if that answers your question. If not, please explain a little more fully what it is you want to know. – Andrew Stacey Jun 25 '12 at 14:39
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    To avoid issues like that, normally package writers would use some sort of prefix like REZAenvi or something like that. Something that identifies you as the writer. – azetina Jun 25 '12 at 14:41

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